18719443 has 4 divisors (see below), whose sum is σ = 19323328. Its totient is φ = 18115560.

The previous prime is 18719429. The next prime is 18719473. The reversal of 18719443 is 34491781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34491781 = 113 ⋅305237.

It is a cyclic number.

It is not a de Polignac number, because 18719443 - 2¹⁷ = 18588371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18719423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301896 + ... + 301957.

It is an arithmetic number, because the mean of its divisors is an integer number (4830832).

Almost surely, 2^18719443 is an apocalyptic number.

18719443 is a deficient number, since it is larger than the sum of its proper divisors (603885).

18719443 is an equidigital number, since it uses as much as digits as its factorization.

18719443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603884.

The product of its digits is 24192, while the sum is 37.

The square root of 18719443 is about 4326.5971617427. The cubic root of 18719443 is about 265.5202453461.

The spelling of 18719443 in words is "eighteen million, seven hundred nineteen thousand, four hundred forty-three".